[06/16] net/cnxk: use previous value atomic fetch operations
Checks
Commit Message
Use __atomic_fetch_{add,and,or,sub,xor} instead of
__atomic_{add,and,or,sub,xor}_fetch adding the necessary code to
allow consumption of the resulting value.
Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
drivers/net/cnxk/cn10k_tx.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Comments
Acked-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> -----Original Message-----
> From: Tyler Retzlaff <roretzla@linux.microsoft.com>
> Sent: Saturday, March 11, 2023 3:45 AM
> To: dev@dpdk.org
> Cc: Honnappa.Nagarahalli@arm.com; Ruifeng.Wang@arm.com; thomas@monjalon.net;
> Tyler Retzlaff <roretzla@linux.microsoft.com>
> Subject: [EXT] [PATCH 06/16] net/cnxk: use previous value atomic fetch operations
>
> External Email
>
> ----------------------------------------------------------------------
> Use __atomic_fetch_{add,and,or,sub,xor} instead of
> __atomic_{add,and,or,sub,xor}_fetch adding the necessary code to
> allow consumption of the resulting value.
>
> Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
> ---
> drivers/net/cnxk/cn10k_tx.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
> index a72a803..c9ec01c 100644
> --- a/drivers/net/cnxk/cn10k_tx.h
> +++ b/drivers/net/cnxk/cn10k_tx.h
> @@ -108,7 +108,7 @@
> retry:
> while (__atomic_load_n(&txq->fc_cache_pkts, __ATOMIC_RELAXED) < 0)
> ;
> - cached = __atomic_sub_fetch(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE);
> + cached = __atomic_fetch_sub(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE) -
> req;
> /* Check if there is enough space, else update and retry. */
> if (cached < 0) {
> /* Check if we have space else retry. */
> @@ -302,7 +302,7 @@
>
> again:
> fc_sw = txq->cpt_fc_sw;
> - val = __atomic_sub_fetch(fc_sw, nb_pkts, __ATOMIC_RELAXED);
> + val = __atomic_fetch_sub(fc_sw, nb_pkts, __ATOMIC_RELAXED) - nb_pkts;
> if (likely(val >= 0))
> return;
>
> --
> 1.8.3.1
@@ -108,7 +108,7 @@
retry:
while (__atomic_load_n(&txq->fc_cache_pkts, __ATOMIC_RELAXED) < 0)
;
- cached = __atomic_sub_fetch(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE);
+ cached = __atomic_fetch_sub(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE) - req;
/* Check if there is enough space, else update and retry. */
if (cached < 0) {
/* Check if we have space else retry. */
@@ -302,7 +302,7 @@
again:
fc_sw = txq->cpt_fc_sw;
- val = __atomic_sub_fetch(fc_sw, nb_pkts, __ATOMIC_RELAXED);
+ val = __atomic_fetch_sub(fc_sw, nb_pkts, __ATOMIC_RELAXED) - nb_pkts;
if (likely(val >= 0))
return;